Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 459 insertions, 0 deletions

diff --git a/qemu/hw/net/vhost_net.c b/qemu/hw/net/vhost_net.c
new file mode 100644
index 000000000..5c1d11f51
--- /dev/null
+++ b/qemu/hw/net/vhost_net.c
@@ -0,0 +1,459 @@
+/*
+ * vhost-net support
+ *
+ * Copyright Red Hat, Inc. 2010
+ *
+ * Authors:
+ *  Michael S. Tsirkin <mst@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
+ */
+
+#include "net/net.h"
+#include "net/tap.h"
+#include "net/vhost-user.h"
+
+#include "hw/virtio/virtio-net.h"
+#include "net/vhost_net.h"
+#include "qemu/error-report.h"
+
+#include "config.h"
+
+#ifdef CONFIG_VHOST_NET
+#include <linux/vhost.h>
+#include <sys/socket.h>
+#include <linux/kvm.h>
+#include <fcntl.h>
+#include <netpacket/packet.h>
+#include <net/ethernet.h>
+#include <net/if.h>
+#include <netinet/in.h>
+
+#include <stdio.h>
+
+#include "standard-headers/linux/virtio_ring.h"
+#include "hw/virtio/vhost.h"
+#include "hw/virtio/virtio-bus.h"
+#include "hw/virtio/virtio-access.h"
+
+struct vhost_net {
+    struct vhost_dev dev;
+    struct vhost_virtqueue vqs[2];
+    int backend;
+    NetClientState *nc;
+};
+
+/* Features supported by host kernel. */
+static const int kernel_feature_bits[] = {
+    VIRTIO_F_NOTIFY_ON_EMPTY,
+    VIRTIO_RING_F_INDIRECT_DESC,
+    VIRTIO_RING_F_EVENT_IDX,
+    VIRTIO_NET_F_MRG_RXBUF,
+    VIRTIO_F_VERSION_1,
+    VHOST_INVALID_FEATURE_BIT
+};
+
+/* Features supported by others. */
+static const int user_feature_bits[] = {
+    VIRTIO_F_NOTIFY_ON_EMPTY,
+    VIRTIO_RING_F_INDIRECT_DESC,
+    VIRTIO_RING_F_EVENT_IDX,
+
+    VIRTIO_F_ANY_LAYOUT,
+    VIRTIO_F_VERSION_1,
+    VIRTIO_NET_F_CSUM,
+    VIRTIO_NET_F_GUEST_CSUM,
+    VIRTIO_NET_F_GSO,
+    VIRTIO_NET_F_GUEST_TSO4,
+    VIRTIO_NET_F_GUEST_TSO6,
+    VIRTIO_NET_F_GUEST_ECN,
+    VIRTIO_NET_F_GUEST_UFO,
+    VIRTIO_NET_F_HOST_TSO4,
+    VIRTIO_NET_F_HOST_TSO6,
+    VIRTIO_NET_F_HOST_ECN,
+    VIRTIO_NET_F_HOST_UFO,
+    VIRTIO_NET_F_MRG_RXBUF,
+    VIRTIO_NET_F_STATUS,
+    VIRTIO_NET_F_CTRL_VQ,
+    VIRTIO_NET_F_CTRL_RX,
+    VIRTIO_NET_F_CTRL_VLAN,
+    VIRTIO_NET_F_CTRL_RX_EXTRA,
+    VIRTIO_NET_F_CTRL_MAC_ADDR,
+    VIRTIO_NET_F_CTRL_GUEST_OFFLOADS,
+
+    VIRTIO_NET_F_MQ,
+
+    VHOST_INVALID_FEATURE_BIT
+};
+
+static const int *vhost_net_get_feature_bits(struct vhost_net *net)
+{
+    const int *feature_bits = 0;
+
+    switch (net->nc->info->type) {
+    case NET_CLIENT_OPTIONS_KIND_TAP:
+        feature_bits = kernel_feature_bits;
+        break;
+    case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
+        feature_bits = user_feature_bits;
+        break;
+    default:
+        error_report("Feature bits not defined for this type: %d",
+                net->nc->info->type);
+        break;
+    }
+
+    return feature_bits;
+}
+
+uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
+{
+    return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
+            features);
+}
+
+void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
+{
+    net->dev.acked_features = net->dev.backend_features;
+    vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
+}
+
+static int vhost_net_get_fd(NetClientState *backend)
+{
+    switch (backend->info->type) {
+    case NET_CLIENT_OPTIONS_KIND_TAP:
+        return tap_get_fd(backend);
+    default:
+        fprintf(stderr, "vhost-net requires tap backend\n");
+        return -EBADFD;
+    }
+}
+
+struct vhost_net *vhost_net_init(VhostNetOptions *options)
+{
+    int r;
+    bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL;
+    struct vhost_net *net = g_malloc(sizeof *net);
+
+    if (!options->net_backend) {
+        fprintf(stderr, "vhost-net requires net backend to be setup\n");
+        goto fail;
+    }
+
+    if (backend_kernel) {
+        r = vhost_net_get_fd(options->net_backend);
+        if (r < 0) {
+            goto fail;
+        }
+        net->dev.backend_features = qemu_has_vnet_hdr(options->net_backend)
+            ? 0 : (1ULL << VHOST_NET_F_VIRTIO_NET_HDR);
+        net->backend = r;
+    } else {
+        net->dev.backend_features = 0;
+        net->backend = -1;
+    }
+    net->nc = options->net_backend;
+
+    net->dev.nvqs = 2;
+    net->dev.vqs = net->vqs;
+
+    r = vhost_dev_init(&net->dev, options->opaque,
+                       options->backend_type);
+    if (r < 0) {
+        goto fail;
+    }
+    if (backend_kernel) {
+        if (!qemu_has_vnet_hdr_len(options->net_backend,
+                               sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
+            net->dev.features &= ~(1ULL << VIRTIO_NET_F_MRG_RXBUF);
+        }
+        if (~net->dev.features & net->dev.backend_features) {
+            fprintf(stderr, "vhost lacks feature mask %" PRIu64
+                   " for backend\n",
+                   (uint64_t)(~net->dev.features & net->dev.backend_features));
+            vhost_dev_cleanup(&net->dev);
+            goto fail;
+        }
+    }
+    /* Set sane init value. Override when guest acks. */
+    vhost_net_ack_features(net, 0);
+    return net;
+fail:
+    g_free(net);
+    return NULL;
+}
+
+static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
+{
+    net->dev.vq_index = vq_index;
+}
+
+static int vhost_net_set_vnet_endian(VirtIODevice *dev, NetClientState *peer,
+                                     bool set)
+{
+    int r = 0;
+
+    if (virtio_has_feature(dev, VIRTIO_F_VERSION_1) ||
+        (virtio_legacy_is_cross_endian(dev) && !virtio_is_big_endian(dev))) {
+        r = qemu_set_vnet_le(peer, set);
+        if (r) {
+            error_report("backend does not support LE vnet headers");
+        }
+    } else if (virtio_legacy_is_cross_endian(dev)) {
+        r = qemu_set_vnet_be(peer, set);
+        if (r) {
+            error_report("backend does not support BE vnet headers");
+        }
+    }
+
+    return r;
+}
+
+static int vhost_net_start_one(struct vhost_net *net,
+                               VirtIODevice *dev)
+{
+    struct vhost_vring_file file = { };
+    int r;
+
+    net->dev.nvqs = 2;
+    net->dev.vqs = net->vqs;
+
+    r = vhost_dev_enable_notifiers(&net->dev, dev);
+    if (r < 0) {
+        goto fail_notifiers;
+    }
+
+    r = vhost_dev_start(&net->dev, dev);
+    if (r < 0) {
+        goto fail_start;
+    }
+
+    if (net->nc->info->poll) {
+        net->nc->info->poll(net->nc, false);
+    }
+
+    if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
+        qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
+        file.fd = net->backend;
+        for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
+            const VhostOps *vhost_ops = net->dev.vhost_ops;
+            r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
+                                      &file);
+            if (r < 0) {
+                r = -errno;
+                goto fail;
+            }
+        }
+    }
+    return 0;
+fail:
+    file.fd = -1;
+    if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
+        while (file.index-- > 0) {
+            const VhostOps *vhost_ops = net->dev.vhost_ops;
+            int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
+                                          &file);
+            assert(r >= 0);
+        }
+    }
+    if (net->nc->info->poll) {
+        net->nc->info->poll(net->nc, true);
+    }
+    vhost_dev_stop(&net->dev, dev);
+fail_start:
+    vhost_dev_disable_notifiers(&net->dev, dev);
+fail_notifiers:
+    return r;
+}
+
+static void vhost_net_stop_one(struct vhost_net *net,
+                               VirtIODevice *dev)
+{
+    struct vhost_vring_file file = { .fd = -1 };
+
+    if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
+        for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
+            const VhostOps *vhost_ops = net->dev.vhost_ops;
+            int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
+                                          &file);
+            assert(r >= 0);
+        }
+    } else if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER) {
+        for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
+            const VhostOps *vhost_ops = net->dev.vhost_ops;
+            int r = vhost_ops->vhost_call(&net->dev, VHOST_RESET_OWNER,
+                                          NULL);
+            assert(r >= 0);
+        }
+    }
+    if (net->nc->info->poll) {
+        net->nc->info->poll(net->nc, true);
+    }
+    vhost_dev_stop(&net->dev, dev);
+    vhost_dev_disable_notifiers(&net->dev, dev);
+}
+
+int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
+                    int total_queues)
+{
+    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
+    VirtioBusState *vbus = VIRTIO_BUS(qbus);
+    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
+    int r, e, i;
+
+    if (!k->set_guest_notifiers) {
+        error_report("binding does not support guest notifiers");
+        r = -ENOSYS;
+        goto err;
+    }
+
+    r = vhost_net_set_vnet_endian(dev, ncs[0].peer, true);
+    if (r < 0) {
+        goto err;
+    }
+
+    for (i = 0; i < total_queues; i++) {
+        vhost_net_set_vq_index(get_vhost_net(ncs[i].peer), i * 2);
+    }
+
+    r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
+    if (r < 0) {
+        error_report("Error binding guest notifier: %d", -r);
+        goto err_endian;
+    }
+
+    for (i = 0; i < total_queues; i++) {
+        r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
+
+        if (r < 0) {
+            goto err_start;
+        }
+    }
+
+    return 0;
+
+err_start:
+    while (--i >= 0) {
+        vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
+    }
+    e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
+    if (e < 0) {
+        fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
+        fflush(stderr);
+    }
+err_endian:
+    vhost_net_set_vnet_endian(dev, ncs[0].peer, false);
+err:
+    return r;
+}
+
+void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
+                    int total_queues)
+{
+    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
+    VirtioBusState *vbus = VIRTIO_BUS(qbus);
+    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
+    int i, r;
+
+    for (i = 0; i < total_queues; i++) {
+        vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
+    }
+
+    r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
+    if (r < 0) {
+        fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
+        fflush(stderr);
+    }
+    assert(r >= 0);
+
+    assert(vhost_net_set_vnet_endian(dev, ncs[0].peer, false) >= 0);
+}
+
+void vhost_net_cleanup(struct vhost_net *net)
+{
+    vhost_dev_cleanup(&net->dev);
+    g_free(net);
+}
+
+bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
+{
+    return vhost_virtqueue_pending(&net->dev, idx);
+}
+
+void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
+                              int idx, bool mask)
+{
+    vhost_virtqueue_mask(&net->dev, dev, idx, mask);
+}
+
+VHostNetState *get_vhost_net(NetClientState *nc)
+{
+    VHostNetState *vhost_net = 0;
+
+    if (!nc) {
+        return 0;
+    }
+
+    switch (nc->info->type) {
+    case NET_CLIENT_OPTIONS_KIND_TAP:
+        vhost_net = tap_get_vhost_net(nc);
+        break;
+    case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
+        vhost_net = vhost_user_get_vhost_net(nc);
+        break;
+    default:
+        break;
+    }
+
+    return vhost_net;
+}
+#else
+struct vhost_net *vhost_net_init(VhostNetOptions *options)
+{
+    error_report("vhost-net support is not compiled in");
+    return NULL;
+}
+
+int vhost_net_start(VirtIODevice *dev,
+                    NetClientState *ncs,
+                    int total_queues)
+{
+    return -ENOSYS;
+}
+void vhost_net_stop(VirtIODevice *dev,
+                    NetClientState *ncs,
+                    int total_queues)
+{
+}
+
+void vhost_net_cleanup(struct vhost_net *net)
+{
+}
+
+uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
+{
+    return features;
+}
+void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
+{
+}
+
+bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
+{
+    return false;
+}
+
+void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
+                              int idx, bool mask)
+{
+}
+
+VHostNetState *get_vhost_net(NetClientState *nc)
+{
+    return 0;
+}
+#endif